90+66-x=120

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Solution for 90+66-x=120 equation: 



90+66-x=120

We move all terms to the left:

90+66-x-(120)=0

We add all the numbers together, and all the variables

-1x+36=0

We move all terms containing x to the left, all other terms to the right

-x=-36

x=-36/-1

x=+36

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